CN220679278U

CN220679278U - Casting model structure for basket type differential shell

Info

Publication number: CN220679278U
Application number: CN202322292784.7U
Authority: CN
Inventors: 孟春凤
Original assignee: Cmw Tianjin Industry Co ltd
Current assignee: Cmw Tianjin Industry Co ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2024-03-29
Anticipated expiration: 2033-08-24

Abstract

The utility model discloses a casting model structure for a flower basket type differential shell, which comprises the following components: the casting body is internally provided with a lower shaft hole solid block, the inner wall of the casting body is provided with a spherical chill and a pin hole chill, a sand core is arranged in the inner cavity of the casting body, the spherical chill and the pin hole chill are embedded into the sand core, the upper end surface of the sand core is provided with a riser, the planetary gear of the casting body is matched with the spherical surface position, the inner side flange position and the pin hole position, and the outer end surface flange position are not shrinkage cavity, so that the quality requirement is met, and the problem of shrinkage cavity production of a differential case is effectively solved; the use of a plurality of risers is avoided due to the application of the chill, the dimensional stability of castings is improved, the starting balance effect is good, only one riser is used in the whole process, the process yield is improved, the yield is improved, and the production cost is reduced.

Description

Casting model structure for basket type differential shell

Technical Field

The utility model relates to the technical field of casting, in particular to a casting model structure for a basket type differential shell.

Background

The current automobile industry develops rapidly, the requirement of people on vehicles is separated from the so-called 'riding instead of walk' requirement mode in the eighth nineties, and along with the progress of economic development technology, the people put higher and higher requirements on the running performance of the vehicles. It is known that the running performance of a vehicle, in addition to the power provided by the engine, mainly depends on the transmission system to achieve a change in the rotational speed of the left and right wheels, wherein the differential housing is a critical component. The shrinkage porosity defect of the existing differential housing production technology cannot be effectively solved, the dynamic unbalance amount requirement level cannot be achieved, the riser feeding efficiency is low, the yield is low, and the reject ratio is high.

Disclosure of Invention

The utility model aims to provide a casting model structure for a basket type differential case, which solves the problems that the shrinkage porosity defect cannot be effectively solved, the dynamic unbalance amount requirement level cannot be achieved, the riser feeding efficiency is low, the yield is low and the reject ratio is high in the existing differential case production technology by arranging a lower shaft hole solid block, a casting body, a spherical chiller, a pin hole chiller, a riser and a sand core.

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

a casting model structure for a basket type differential shell, comprising: the casting comprises a casting body, wherein a lower shaft hole solid block is arranged at the inner bottom of the casting body, a spherical chill and a pin hole chill are arranged on the inner wall of the casting body, a sand core is arranged in the inner cavity of the casting body, the spherical chill and the pin hole chill are embedded into the sand core, and a riser is arranged on the upper end face of the sand core.

As the preferable technical scheme, a plurality of spherical concave surfaces are arranged on the inner wall of the casting body, one end of the spherical chill which is a cylinder is embedded into the sand core, and one end of the spherical chill which is a circular arc end surface is contacted with the spherical concave surfaces.

As an optimal technical scheme, the pin hole chill is a special-shaped chill, is formed by combining a cylinder and an annular cube, and is embedded into the sand core;

the pin hole chill contacts with the pin hole of the casting body and the upper end surface of the internal flange, wherein the surface of the cylinder contacts with the pin hole, and the annular cube contacts with the upper end surface of the internal flange.

As the preferable technical scheme, the upper end of the riser is a cylinder, the lower end of the riser is a horseshoe-shaped cube, and the bottom surface of the horseshoe-shaped cube is overlapped with the upper surface of the flange at the upper end of the casting body.

As a preferable technical scheme, the overlapping width of the bottom surface of the horseshoe-shaped cube and the upper surface of the upper flange of the casting body is 1-5mm.

The utility model has at least the following beneficial effects:

according to the casting model structure for the basket type differential shell, the inner cavity of the differential shell is formed by the sand core, the spherical chill, the pin hole chill and the lower shaft hole solid block, the outer shape is formed by the sand mould, the spherical chill and the pin hole chill form a part of the sand core, the riser is formed by the sand mould, so that the planetary gear of the casting body is matched with the spherical position, the inner flange position, the pin hole position and the outer end flange position are all free from shrinkage porosity, the quality requirement of the differential shell is met, and the problem of shrinkage porosity in the differential shell production is effectively solved;

the use of a plurality of risers is avoided due to the application of the chill, the dimensional stability of castings is improved, the starting balance effect is good, only one riser is used in the whole process, the process yield is improved, the yield is improved, and the production cost is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a first perspective view of an installed sand core of a casting model structure for a basket style differential shell of the present utility model;

FIG. 2 is a second perspective view of an installed sand core of a casting mold structure for a basket style differential shell of the present utility model;

FIG. 3 is a third perspective view of an installed sand core of a casting mold structure for a basket style differential shell of the present utility model;

FIG. 4 is a first perspective view of an uninstalled sand core of a casting mold structure for a basket style differential shell of the present utility model;

FIG. 5 is a second perspective view of an uninstalled sand core of the casting mold structure for a basket style differential shell of the present utility model;

FIG. 6 is a third perspective view of an uninstalled sand core of a casting mold structure for a basket style differential shell according to the present utility model.

Reference numerals illustrate:

1. a lower shaft hole solid block; 2. a casting body; 3. spherical chill; 4. pin hole chill; 5. riser; 6. and (5) a sand core.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so that the implementation process of how the technical means are applied to solve the technical problems and achieve the technical effects of the present application can be fully understood and implemented accordingly.

Referring to fig. 1 to 6, an embodiment of the present utility model provides a casting model structure for a basket type differential shell, comprising: the casting body 2, lower shaft hole solid piece 1 is installed to the inner bottom of casting body 2, install sphere chill 3 and pinhole chill 4 on the inner wall of casting body 2, install psammitolite 6 in the inner chamber of casting body 2, sphere chill 3 and pinhole chill 4 imbeds psammitolite 6 inside, the up end of psammitolite 6 is equipped with riser 5, the inner chamber of poor shell is by psammitolite 6, sphere chill 3, pinhole chill 4 and the shaping of lower shaft hole solid piece 1, the external form is by sand mould shaping, sphere chill 3 and pinhole chill 4 become a part of moulding sand core 6, riser 5 is by sand mould shaping, the dimensional stability of foundry goods has been promoted, it is effectual to start balance, whole technology only uses a riser, make the technology yield very high, differential mechanism casing production shrinkage porosity problem has been solved effectively.

The inner wall of the casting body 2 is provided with a plurality of spherical concave surfaces, one end of the spherical chill 3 which is a cylinder is embedded into the sand core 6, one end of the spherical chill 3 which is a circular arc end surface is in contact with the spherical concave surfaces, so that the number of the spherical chills 3 is four, the spherical chill 3 rapidly collects and transfers heat at the spherical concave surfaces, so that the thermal nodes at the spherical concave surfaces are smaller, the thermal nodes are rapidly solidified, shrinkage porosity is reduced, the pinhole chill 4 is a special-shaped chill, is formed by combining the cylinder and an annular cube, and is embedded into the sand core 6; the pin hole chill 4 contacts with the pin hole of the casting body 2 and the upper end surface of the inner flange, wherein the surface of the cylinder contacts with the pin hole, the annular cube contacts with the upper end surface of the inner flange, the number of the pin holes on the casting body 2 is four, so the pin hole chill 4 is four, the pin hole chill 4 rapidly collects and transfers the heat of the pin hole and the inner flange end surface, the thermal node is smaller, the heat is rapidly solidified, the shrinkage porosity is reduced, the upper end of the riser 5 is a cylinder, the lower end is a horseshoe cube, the bottom surface of the horseshoe cube is lapped with the upper surface of the upper flange of the casting body 2, the riser 5 is used for feeding the upper flange, the shrinkage porosity problem of the upper flange is solved, the lapping width of the bottom surface of the horseshoe cube and the upper flange of the casting body 2 is 1-5mm, preferably 3mm, and the installation stability of the riser 5 is increased.

Working principle: the outer shape of the riser 5 and the outer shape of the casting body 2 are formed by sand molds, the spherical chill 3 and the pin hole chill 4 are respectively contacted with the spherical surface and the pin hole of the casting body 2 and are embedded in a sand core 6, the sand core 6 wraps the spherical chill 3 and the pin hole chill 4, and the inner cavity of the casting body 2 is formed;

after the die cavity is filled with molten iron, the casting body 2 and the lower shaft hole solid block 1 are filled with molten iron, at the moment, the four spherical chill 3 and the four pin hole chill 4 collect and transfer heat at the end faces of the spherical surface, the pin hole and the inner flange rapidly, so that thermal nodes are smaller and solidify rapidly, shrinkage porosity is reduced, at the moment, the thermal nodes are mainly concentrated at the upper flange of the casting body 2 and the center part of the lower shaft hole, riser heads 5 are arranged at the upper flange to feed the thermal nodes, the shrinkage porosity problem at the position is solved, shrinkage porosity at the position of the lower shaft hole is concentrated at the center part of the lower shaft hole solid block 1, and finally, part of materials are mechanically removed (namely, mechanically processed and removed), so that the problem of shrinkage porosity in the production of the differential case is effectively solved.

While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims

1. A casting model structure for a basket type differential case, comprising:

foundry goods body (2), lower shaft hole solid block (1) is installed to the interior bottom of foundry goods body (2), install sphere chill (3) and pinhole chill (4) on the inner wall of foundry goods body (2), install psammitolite (6) in the inner chamber of foundry goods body (2), sphere chill (3) with pinhole chill (4) are embedded inside psammitolite (6), the up end of psammitolite (6) is equipped with riser (5).

2. A casting model structure for a basket type differential case according to claim 1, characterized in that: the casting is characterized in that a plurality of spherical concave surfaces are arranged on the inner wall of the casting body (2), one end of the spherical chill (3) which is a cylinder is embedded into the sand core (6), and one end of the spherical chill (3) which is a circular arc end surface is in contact with the spherical concave surfaces.

3. A casting model structure for a basket type differential case according to claim 2, characterized in that: the pin hole chill (4) is a special chill, is formed by combining a cylinder and an annular cube, and is embedded into the sand core (6);

the pin hole chill (4) is contacted with the pin hole of the casting body (2) and the upper end surface of the inner flange, wherein the surface of the cylinder is contacted with the pin hole, and the annular cube is contacted with the upper end surface of the inner flange.

4. A casting model structure for a basket type differential case according to claim 1, characterized in that: the upper end of the riser (5) is a cylinder, the lower end of the riser is a horseshoe-shaped cube, and the bottom surface of the horseshoe-shaped cube is overlapped with the upper surface of the flange at the upper end of the casting body (2).

5. The casting model structure for a basket type differential case according to claim 4, wherein: the overlapping width of the bottom surface of the horseshoe-shaped cube and the upper surface of the upper end flange of the casting body (2) is 1-5mm.